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Your search keyword '"Silva, Márcio R."' showing total 7 results
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7 results on '"Silva, Márcio R."'

1. Micro-Addition of Silver to Copper: One Small Step in Composition, a Change for a Giant Leap in Biocidal Activity

Author

Vital, Vitor G., primary, Silva, Márcio R., additional, Santos, Vinicius T., additional, Lobo, Flávia G., additional, Xander, Patrícia, additional, Zauli, Rogéria C., additional, Moraes, Carolina B., additional, Freitas-Junior, Lucio H., additional, Barbosa, Cecíla G., additional, Pellosi, Diogo S., additional, Silva, Ricardo A. G., additional, Paganotti, André, additional, and Vasconcellos, Suzan P., additional

Published
2024
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2. Analysis of the Influence Of Friction Stir Welding on the Microstructure and Mechanical Properties of Alloy UNS-C27200 (CU-ZN)

Author

Rosa, Renato F., Almeida, Italo O., Varasquim, Francisco M. F. A., Junior, Eli J. C., Couto, Antônio A., Santos, Vinicius T., Silva, Márcio R., Nakamoto, Francisco Y., and Santos, Givanildo A.

Subjects
Friction stir welding - FSW, UNS-C27200, mechanical behavior, lap joint
Abstract

The copper alloy UNS-C27200 is a binary brass, composed of 38wt%Zn, beeing one of the most used in the industry. The union of Cu-Zn alloys by conventional welding by fusion in thin plates presents several challenges. The Friction Stir Welding (FSW) process performs the union of two, or more materials, through a rotating tool that travels throughout the welding region. One the great advantages of FSW is working below the melting point of the material, which reduces the change in the microstructure and properties of the material, when compared to conventional welding processes. Due to the lack of research on FSW process in lap brass joints with thin thicknesses, the present work aims to expand these studies in order to contribute to future research. Eight conditions were evaluated, varying rotation and welding speed. In the best results by visual inspection, analyzes of microstructure, temperature, microhardness and mechanical strength were performed. The better welding results were obtained with ω=1050 rpm and ν=20 mm/min. There was reduction of approximately 50% between Stir Zone and Base metal. The mechanical strength was affected by the pin hole resulting from the process. The microstructure revealed a homogeneous mixture in the stir zone and no defects were detected.

Published
2023

4. Matrix Assisted Laser Desorption Ionization-Time-of-Flight mass spectrometry identification of Mycobacterium bovis in Bovinae

Author

BACANELLI, Gisele, primary, OLARTE, Larissa C., additional, SILVA, Márcio R., additional, RODRIGUES, Rudielle A., additional, CARNEIRO, Paulo A.M., additional, KANEENE, John B., additional, PASQUATTI, Taynara N., additional, TAKATANI, Haruo, additional, ZUMÁRRAGA, Martin J., additional, ETGES, Rodrigo N., additional, ARAÚJO, Flábio R., additional, and VERBISCK, Newton V., additional

Published
2019
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7. Microencapsulation of DEET in Solid Lipid Microparticles: production, characterization and safety evaluation.

Author

Santos PA, Silva MRMD, Tavares M, and Ricci-Junior E

Subjects
Lipids, Skin, Skin Absorption, DEET chemistry, DEET metabolism, Insect Repellents chemistry, Insect Repellents metabolism
Abstract

DEET is considered the gold standard for insect repellent products. However, it behaves as a strong skin permeant. DEET was encapsulated in Solid Lipid Microparticles (SLM) and characterized in terms of morphology, particle size, cytotoxicity and ex vivo permeation. The particles exhibited micrometric size with a spherical shape. In addition, we developed and validated an analytical method for DEET quantification by high performance liquid chromatography (HPLC), which was selective, linear, precise, accurate and robust. The toxicity test in cell culture of keratinocytes, fibroblasts and macrophages showed that the formulation did not present cytotoxicity. The SLM were able to decrease the skin permeation of DEET in relation to the free active in ethanol with gain in the safe. Microparticles were able to increase the skin retention of DEET, which can contribute to extend the time of repellent action. The results showed that Solid Lipid Microparticles are safe and promising topical formulation to insect bite prevention.

Published
2022
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